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venv/Lib/site-packages/django/contrib/messages/storage/session.py

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+import json
+
+from django.contrib.messages.storage.base import BaseStorage
+from django.contrib.messages.storage.cookie import (
+    MessageDecoder, MessageEncoder,
+)
+from django.core.exceptions import ImproperlyConfigured
+
+
+class SessionStorage(BaseStorage):
+    """
+    Store messages in the session (that is, django.contrib.sessions).
+    """
+    session_key = '_messages'
+
+    def __init__(self, request, *args, **kwargs):
+        if not hasattr(request, 'session'):
+            raise ImproperlyConfigured(
+                'The session-based temporary message storage requires session '
+                'middleware to be installed, and come before the message '
+                'middleware in the MIDDLEWARE list.'
+            )
+        super().__init__(request, *args, **kwargs)
+
+    def _get(self, *args, **kwargs):
+        """
+        Retrieve a list of messages from the request's session. This storage
+        always stores everything it is given, so return True for the
+        all_retrieved flag.
+        """
+        return self.deserialize_messages(self.request.session.get(self.session_key)), True
+
+    def _store(self, messages, response, *args, **kwargs):
+        """
+        Store a list of messages to the request's session.
+        """
+        if messages:
+            self.request.session[self.session_key] = self.serialize_messages(messages)
+        else:
+            self.request.session.pop(self.session_key, None)
+        return []
+
+    def serialize_messages(self, messages):
+        encoder = MessageEncoder()
+        return encoder.encode(messages)
+
+    def deserialize_messages(self, data):
+        if data and isinstance(data, str):
+            return json.loads(data, cls=MessageDecoder)
+        return data